D-glucose pentakis[3,4-dihydroxy-5-[(trihydroxy-3,4,5-benzoyl)oxy]benzoate] Chemical Properties

Density 

2.12±0.1 g/cm3(Predicted)

pka

6.00±0.50(Predicted)

LogP

6.184 (est)

CAS DataBase Reference

72401-53-7

EPA Substance Registry System

D-Glucopyranose, pentakis[3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoate] (72401-53-7)

D-glucose pentakis[3,4-dihydroxy-5-[(trihydroxy-3,4,5-benzoyl)oxy]benzoate] Usage And Synthesis

Chemical Properties

Yellowish-white to light brown amorphous powder, or flaky, spongy lumps. Has a peculiar odor. Taste astringent, astringent. General goods contain about 10% moisture. In the air and light will gradually oxidize and become brown, when heated to 210 ~ 215 ℃ decomposition into o-benzenetriol and carbon dioxide gas. Protein, starch, gelatin, most alkaloids and metal sodium salts can make it precipitate, when encountered with trivalent iron salts that is black pigment and precipitation. Easily soluble in water (300%), hot glycerol (1:1) and ethanol, acetone, etc., almost insoluble in benzene, chloroform, ether and hexane solvent, insoluble in anhydrous ethanol. The aqueous solution is acidic. The natural product is widely found in the roots, skin, rods, leaves and fruits of plants.

Definition

ChEBI: Tannic acid is a gallotannin obtained by acylation of the five hydroxy groups of D-glucose by 3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoic acid (a gallic acid dimer). It has a role as a carcinogenic agent, a metabolite and a geroprotector. It is a gallotannin, a D-glucoside and a monosaccharide derivative. It is functionally related to a gallic acid.